References for Ceratophyllaceae
Ceska, A., and O. Ceska. 1980. Additions to the flora of British Columbia. Can. Field-Nat. 94:69-74.
Fassett, N.C. 1953. North American Ceratophyllum. Communicaciones del Instituto tropical de Investigaciones scientificas, Universidad de El Salvador 2:25-45.

Source for the Reference Lists

George W. Douglas, Del Meidinger and Jim Pojar. 1998-2002. Illustrated Flora of British Columbia.